The main PerBI views are Bar and Line graphs.
The contents of these graphs are selected from a drop down list of model columns that were in the data source and for advanced users values derived from those columns programmatically using a BASIC type language.
This BASIC type language we call ASL initially sounds quite daunting but is in fact very easy to use and once learnt gives the application its real power.
Many Business Intelligence solutions require that a Model has to be designed and then you can cut and dice this model in all sorts of wonderful ways.
If you decide that you want to see the data in a way that the Model didn't envisage then things can become difficult.